Method and apparatus for processing open state in wireless communication system

ABSTRACT

A method and apparatus for processing Open state is provided, the method comprising receiving a Control Channel and a Forward Traffic Channel, requesting a MultipleInputMultipleOutput(MIMO) mode on the Forward Traffic Channel by sending a MIMORequest message, monitoring overhead messages and determining if the access terminal receives a ConnectionClose messages.

The present Application for Patent claims priority to ProvisionalApplication Ser. No. 60/731,126, entitled “METHODS AND APPARATUS FORPROVIDING MOBILE BROADBAND WIRELESS LOWER MAC”, filed Oct. 27, 2005,assigned to the assignee hereof, and expressly incorporated herein byreference.

BACKGROUND

1. Field

The present disclosure relates generally to wireless communication andmore particularly to methods and apparatus for processing Open state.

2. Background

Wireless communication systems have become a prevalent means by which amajority of people worldwide have come to communicate. Wirelesscommunication devices have become smaller and more powerful in order tomeet consumer needs and to improve portability and convenience. Theincrease in processing power in mobile devices such as cellulartelephones has lead to an increase in demands on wireless networktransmission systems. Such systems typically are not as easily updatedas the cellular devices that communicate there over. As mobile devicecapabilities expand, it can be difficult to maintain an older wirelessnetwork system in a manner that facilitates fully exploiting new andimproved wireless device capabilities.

Wireless communication systems generally utilize different approaches togenerate transmission resources in the form of channels. These systemsmay be code division multiplexing (CDM) systems, frequency divisionmultiplexing (FDM) systems, and time division multiplexing (TDM)systems. One commonly utilized variant of FDM is orthogonal frequencydivision multiplexing (OFDM) that effectively partitions the overallsystem bandwidth into multiple orthogonal subcarriers. These subcarriersmay also be referred to as tones, bins, and frequency channels. Eachsubcarrier can be modulated with data. With time division basedtechniques, each subcarrier can comprise a portion of sequential timeslices or time slots. Each user may be provided with a one or more timeslot and subcarrier combinations for transmitting and receivinginformation in a defined burst period or frame. The hopping schemes maygenerally be a symbol rate hopping scheme or a block hopping scheme.

Code division based techniques typically transmit data over a number offrequencies available at any time in a range. In general, data isdigitized and spread over available bandwidth, wherein multiple userscan be overlaid on the channel and respective users can be assigned aunique sequence code. Users can transmit in the same wide-band chunk ofspectrum, wherein each user's signal is spread over the entire bandwidthby its respective unique spreading code. This technique can provide forsharing, wherein one or more users can concurrently transmit andreceive. Such sharing can be achieved through spread spectrum digitalmodulation, wherein a user's stream of bits is encoded and spread acrossa very wide channel in a pseudo-random fashion. The receiver is designedto recognize the associated unique sequence code and undo therandomization in order to collect the bits for a particular user in acoherent manner.

A typical wireless communication network (e.g., employing frequency,time, and/or code division techniques) includes one or more basestations that provide a coverage area and one or more mobile (e.g.,wireless) terminals that can transmit and receive data within thecoverage area. A typical base station can simultaneously transmitmultiple data streams for broadcast, multicast, and/or unicast services,wherein a data stream is a stream of data that can be of independentreception interest to a mobile terminal. A mobile terminal within thecoverage area of that base station can be interested in receiving one,more than one or all the data streams transmitted from the base station.Likewise, a mobile terminal can transmit data to the base station oranother mobile terminal. In these systems the bandwidth and other systemresources are assigned utilizing a scheduler.

The signals, signal formats, signal exchanges, methods, processes, andtechniques disclosed herein provide several advantages over knownapproaches. These include, for example, reduced signaling overhead,improved system throughput, increased signaling flexibility, reducedinformation processing, reduced transmission bandwidth, reduced bitprocessing, increased robustness, improved efficiency, and reducedtransmission power

SUMMARY

The following presents a simplified summary of one or more aspects inorder to provide a basic understanding of such aspects. This summary isnot an extensive overview of all contemplated aspects, and is intendedto neither identify key or critical elements of all aspects nordelineate the scope of any or all aspects. Its sole purpose is topresent some concepts of one or more aspects in a simplified form as aprelude to the more detailed description that is presented later.

According to an embodiment, a method is provided for processing Openstate, the method comprising receiving a Control Channel and a ForwardTraffic Channel, requesting a MultipleInputMultipleOutput(MIMO) mode onthe Forward Traffic Channel by sending a MIMORequest message, monitoringoverhead messages and determining if the access terminal receives aConnectionClose messages.

According to another embodiment, a computer readable medium is describedhaving a first set of instructions for receiving a Control Channel and aForward Traffic Channel, a second set of instructions for requesting aMultipleInputMultipleOutput(MIMO) mode on the Forward Traffic Channel bysending a MIMORequest message, a third set of instructions formonitoring overhead messages and a forth set of instructions fordetermining if the access terminal receives a ConnectionClose messages.

According to yet another embodiment, an apparatus operable in a wirelesscommunication system is described which includes means for receiving aControl Channel and a Forward Traffic Channel, means for requesting aMultipleInputMultipleOutput(MIMO) mode on the Forward Traffic Channel bysending a MIMORequest message, means for monitoring overhead messagesand means for determining if the access terminal receives aConnectionClose messages.

According to yet another embodiment, a method is provided for processingOpen state by an access network, the method comprising receiving aReverse Traffic Channel, transmitting on a Forward Traffic Channel,determining if access network receives a ConnectionClose message,returning a ConnectionClosed indication, transitioning to an Inactivestate, determining if access network is closing the connection,transmitting a ConnectionClose message and transitioning to the Closestate.

According to yet another embodiment, a computer-readable medium isdescribed having a first set of instructions for receiving a ReverseTraffic Channel, a second set of instructions for transmitting on aForward Traffic Channel, a third set of instructions for determining ifaccess network receives a ConnectionClose message, a forth set ofinstructions for returning a ConnectionClosed indication, a fifth set ofinstructions for transitioning to an Inactive state, a sixth set ofinstructions for determining if access network is closing theconnection, a seventh set of instructions for transmitting aConnectionClose message and an eighth set of instructions fortransitioning to the Close state.

According to yet another embodiment, an apparatus operable in a wirelesscommunication system is described which includes means for receiving aReverse Traffic Channel, means for transmitting on a Forward TrafficChannel, means for determining if access network receives aConnectionClose message, means for returning a ConnectionClosedindication, means for transitioning to an Inactive state, means fordetermining if access network is closing the connection, means fortransmitting a ConnectionClose message and means for transitioning tothe Close state.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative aspects ofthe one or more aspects. These aspects are indicative, however, of but afew of the various ways in which the principles of various aspects maybe employed and the described aspects are intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates aspects of a multiple access wireless communicationsystem.

FIG. 2 illustrates aspects of a transmitter and receiver in a multipleaccess wireless communication system.

FIGS. 3A and 3B illustrate aspects of superframe structures for amultiple access wireless communication system.

FIG. 4 illustrates aspect of a communication between an access terminaland an access network.

FIG. 5A illustrates a flow diagram of a process used by an accessterminal.

FIG. 5B illustrates one or more processors configured for processingOpen state by an access terminal.

FIG. 6A illustrates a flow diagram of a process used by an accessnetwork.

FIG. 6B illustrates one or more processors configured for processingOpen state by an access network.

DETAILED DESCRIPTION

Various aspects are now described with reference to the drawings,wherein like reference numerals are used to refer to like elementsthroughout. In the following description, for purposes of explanation,numerous specific details are set forth in order to provide a thoroughunderstanding of one or more aspects. It may be evident, however, thatsuch aspect(s) may be practiced without these specific details. In otherinstances, well-known structures and devices are shown in block diagramform in order to facilitate describing one or more aspects.

Referring to FIG. 1, a multiple access wireless communication systemaccording to one aspect is illustrated. A multiple access wirelesscommunication system 100 includes multiple cells, e.g. cells 102, 104,and 106. In the aspect of FIG. 1, each cell 102, 104, and 106 mayinclude an access point 150 that includes multiple sectors. The multiplesectors are formed by groups of antennas each responsible forcommunication with access terminals in a portion of the cell. In cell102, antenna groups 112, 114, and 116 each correspond to a differentsector. In cell 104, antenna groups 118, 120, and 122 each correspond toa different sector. In cell 106, antenna groups 124, 126, and 128 eachcorrespond to a different sector.

Each cell includes several access terminals which are in communicationwith one or more sectors of each access point. For example, accessterminals 130 and 132 are in communication base 142, access terminals134 and 136 are in communication with access point 144, and accessterminals 138 and 140 are in communication with access point 146.

Controller 130 is coupled to each of the cells 102, 104, and 106.Controller 130 may contain one or more connections to multiple networks,e.g. the Internet, other packet based networks, or circuit switchedvoice networks that provide information to, and from, the accessterminals in communication with the cells of the multiple accesswireless communication system 100. The controller 130 includes, or iscoupled with, a scheduler that schedules transmission from and to accessterminals. In other aspects, the scheduler may reside in each individualcell, each sector of a cell, or a combination thereof.

As used herein, an access point may be a fixed station used forcommunicating with the terminals and may also be referred to as, andinclude some or all the functionality of, a base station, a Node B, orsome other terminology. An access terminal may also be referred to as,and include some or all the functionality of, a user equipment (UE), awireless communication device, terminal, a mobile station or some otherterminology.

It should be noted that while FIG. 1, depicts physical sectors, i.e.having different antenna groups for different sectors, other approachesmay be utilized. For example, utilizing multiple fixed “beams” that eachcover different areas of the cell in frequency space may be utilized inlieu of, or in combination with physical sectors. Such an approach isdepicted and disclosed in co-pending U.S. patent application Ser. No.11/260,895, entitled “Adaptive Sectorization in Cellular System.”

Referring to FIG. 2, a block diagram of an aspect of a transmittersystem 210 and a receiver system 250 in a MIMO system 200 isillustrated. At transmitter system 210, traffic data for a number ofdata streams is provided from a data source 212 to transmit (TX) dataprocessor 214. In an aspect, each data stream is transmitted over arespective transmit antenna. TX data processor 214 formats, codes, andinterleaves the traffic data for each data stream based on a particularcoding scheme selected for that data stream to provide coded data.

The coded data for each data stream may be multiplexed with pilot datausing OFDM, or other orthogonalization or non-orthogonalizationtechniques. The pilot data is typically a known data pattern that isprocessed in a known manner and may be used at the receiver system toestimate the channel response. The multiplexed pilot and coded data foreach data stream is then modulated (i.e., symbol mapped) based on one ormore particular modulation schemes (e.g., BPSK, QSPK, M-PSK, or M-QAM)selected for that data stream to provide modulation symbols. The datarate, coding, and modulation for each data stream may be determined byinstructions performed on provided by processor 230.

The modulation symbols for all data streams are then provided to a TXprocessor 220, which may further process the modulation symbols (e.g.,for OFDM). TX processor 220 then provides N_(T) modulation symbolstreams to N_(T) transmitters (TMTR) 222 a through 222 t. Eachtransmitter 222 receives and processes a respective symbol stream toprovide one or more analog signals, and further conditions (e.g.,amplifies, filters, and upconverts) the analog signals to provide amodulated signal suitable for transmission over the MIMO channel. N_(T)modulated signals from transmitters 222 a through 222 t are thentransmitted from N_(T) antennas 224 a through 224 t, respectively.

At receiver system 250, the transmitted modulated signals are receivedby N_(R) antennas 252 a through 252 r and the received signal from eachantenna 252 is provided to a respective receiver (RCVR) 254. Eachreceiver 254 conditions (e.g., filters, amplifies, and downconverts) arespective received signal, digitizes the conditioned signal to providesamples, and further processes the samples to provide a corresponding“received” symbol stream.

An RX data processor 260 then receives and processes the N_(R) receivedsymbol streams from N_(R) receivers 254 based on a particular receiverprocessing technique to provide N_(T) “detected” symbol streams. Theprocessing by RX data processor 260 is described in further detailbelow. Each detected symbol stream includes symbols that are estimatesof the modulation symbols transmitted for the corresponding data stream.RX data processor 260 then demodulates, deinterleaves, and decodes eachdetected symbol stream to recover the traffic data for the data stream.The processing by RX data processor 218 is complementary to thatperformed by TX processor 220 and TX data processor 214 at transmittersystem 210.

RX data processor 260 may be limited in the number of subcarriers thatit may simultaneously demodulate, e.g. 512 subcarriers or 5 MHz, andsuch a receiver should be scheduled on a single carrier. This limitationmay be a function of its FFT range, e.g. sample rates at which theprocessor 260 may operate, the memory available for FFT, or otherfunctions available for demodulation. Further, the greater the number ofsubcarriers utilized, the greater the expense of the access terminal.

The channel response estimate generated by RX processor 260 may be usedto perform space, space/time processing at the receiver, adjust powerlevels, change modulation rates or schemes, or other actions. RXprocessor 260 may further estimate the signal-to-noise-and-interferenceratios (SNRs) of the detected symbol streams, and possibly other channelcharacteristics, and provides these quantities to a processor 270. RXdata processor 260 or processor 270 may further derive an estimate ofthe “operating” SNR for the system. Processor 270 then provides channelstate information (CSI), which may comprise various types of informationregarding the communication link and/or the received data stream. Forexample, the CSI may comprise only the operating SNR. In other aspects,the CSI may comprise a channel quality indicator (CQI), which may be anumerical value indicative of one or more channel conditions. The CSI isthen processed by a TX data processor 278, modulated by a modulator 280,conditioned by transmitters 254 a through 254 r, and transmitted back totransmitter system 210.

At transmitter system 210, the modulated signals from receiver system250 are received by antennas 224, conditioned by receivers 222,demodulated by a demodulator 240, and processed by a RX data processor242 to recover the CSI reported by the receiver system. The reported CSIis then provided to processor 230 and used to (1) determine the datarates and coding and modulation schemes to be used for the data streamsand (2) generate various controls for TX data processor 214 and TXprocessor 220. Alternatively, the CSI may be utilized by processor 270to determine modulation schemes and/or coding rates for transmission,along with other information. This may then be provided to thetransmitter which uses this information, which may be quantized, toprovide later transmissions to the receiver.

Processors 230 and 270 direct the operation at the transmitter andreceiver systems, respectively. Memories 232 and 272 provide storage forprogram codes and data used by processors 230 and 270, respectively.

At the receiver, various processing techniques may be used to processthe N_(R) received signals to detect the N_(T) transmitted symbolstreams. These receiver processing techniques may be grouped into twoprimary categories (i) spatial and space-time receiver processingtechniques (which are also referred to as equalization techniques); and(ii) “successive nulling/equalization and interference cancellation”receiver processing technique (which is also referred to as “successiveinterference cancellation” or “successive cancellation” receiverprocessing technique).

While FIG. 2 discusses a MIMO system, the same system may be applied toa multi-input single-output system where multiple transmit antennas,e.g. those on a base station, transmit one or more symbol streams to asingle antenna device, e.g. a mobile station. Also, a single output tosingle input antenna system may be utilized in the same manner asdescribed with respect to FIG. 2.

The transmission techniques described herein may be implemented byvarious means. For example, these techniques may be implemented inhardware, firmware, software, or a combination thereof. For a hardwareimplementation, the processing units at a transmitter may be implementedwithin one or more application specific integrated circuits (ASICs),digital signal processors (DSPs), digital signal processing devices(DSPDs), programmable logic devices (PLDs), field programmable gatearrays (FPGAs), processors, controllers, micro-controllers,microprocessors, electronic devices, other electronic units designed toperform the functions described herein, or a combination thereof. Theprocessing units at a receiver may also be implemented within one ormore ASICs, DSPs, processors, and so on.

For a software implementation, the transmission techniques may beimplemented with modules (e.g., procedures, functions, and so on) thatperform the functions described herein. The software codes may be storedin a memory (e.g., memory 230, 272 x or 272 y in FIG. 2) and executed bya processor (e.g., processor 232, 270 x or 270 y). The memory may beimplemented within the processor or external to the processor.

It should be noted that the concept of channels herein refers toinformation or transmission types that may be transmitted by the accesspoint or access terminal. It does not require or utilize fixed orpredetermined blocks of subcarriers, time periods, or other resourcesdedicated to such transmissions.

Referring to FIGS. 3A and 3B, aspects of superframe structures for amultiple access wireless communication system are illustrated. FIG. 3Aillustrates aspects of superframe structures for a frequency divisionduplexed (FDD) multiple access wireless communication system, while FIG.3B illustrates aspects of superframe structures for a time divisionduplexed (TDD) multiple access wireless communication system. Thesuperframe preamble may be transmitted separately for each carrier ormay span all of the carriers of the sector.

In both FIGS. 3A and 3B, the forward link transmission is divided intounits of superframes. A superframe may consist of a superframe preamblefollowed by a series of frames. In an FDD system, the reverse link andthe forward link transmission may occupy different frequency bandwidthsso that transmissions on the links do not, or for the most part do not,overlap on any frequency subcarriers. In a TDD system, N forward linkframes and M reverse link frames define the number of sequential forwardlink and reverse link frames that may be continuously transmitted priorto allowing transmission of the opposite type of frame. It should benoted that the number of N and M may be vary within a given superframeor between superframes.

In both FDD and TDD systems each superframe may comprise a superframepreamble. In certain aspects, the superframe preamble includes a pilotchannel that includes pilots that may be used for channel estimation byaccess terminals, a broadcast channel that includes configurationinformation that the access terminal may utilize to demodulate theinformation contained in the forward link frame. Further acquisitioninformation such as timing and other information sufficient for anaccess terminal to communicate on one of the carriers and basic powercontrol or offset information may also be included in the superframepreamble. In other cases, only some of the above and/or otherinformation may be included in this superframe preamble.

As shown in FIGS. 3A and 3B, the superframe preamble is followed by asequence of frames. Each frame may consist of a same or a differentnumber of OFDM symbols, which may constitute a number of subcarriersthat may simultaneously utilized for transmission over some definedperiod. Further, each frame may operate according to a symbol ratehopping mode, where one or more non-contiguous OFDM symbols are assignedto a user on a forward link or reverse link, or a block hopping mode,where users hop within a block of OFDM symbols. The actual blocks orOFDM symbols may or may not hop between frames.

FIG. 4 illustrates communication between an access terminal 402 andaccess network 404 using a communication link 406. In a selectedinterlace mode, the access network sends certain SSCH blocks to theaccess terminal on a set of interlaces called the Selected InterlaceSet. This is described in more detail in Provisional Application Ser.No. 60/731,126, entitled “METHODS AND APPARATUS FOR PROVIDING MOBILEBROADBAND WIRELESS LOWER MAC”, filed Oct. 27, 2005, assigned to theassignee hereof, and expressly incorporated herein by reference. Thecommunication link may be implemented using communicationprotocols/standards such as World Interoperability for Microwave Access(WiMAX), infrared protocols such as Infrared Data Association (IrDA),short-range wireless protocols/technologies, Bluetooth® technology,ZigBee® protocol, ultra wide band (UWB) protocol, home radio frequency(HomeRF), shared wireless access protocol (SWAP), wideband technologysuch as a wireless Ethernet compatibility alliance (WECA), wirelessfidelity alliance (Wi-Fi Alliance), 802.11 network technology, publicswitched telephone network technology, public heterogeneouscommunications network technology such as the Internet, private wirelesscommunications network, land mobile radio network, code divisionmultiple access (CDMA), wideband code division multiple access (WCDMA),universal mobile telecommunications system (UMTS), advanced mobile phoneservice (AMPS), time division multiple access (TDMA), frequency divisionmultiple access (FDMA), orthogonal frequency division multiple (OFDM),orthogonal frequency division multiple access (OFDMA), orthogonalfrequency division multiple FLASH (OFDM-FLASH), global system for mobilecommunications (GSM), single carrier (1×) radio transmission technology(RTT), evolution data only (EV-DO) technology, general packet radioservice (GPRS), enhanced data GSM environment (EDGE), high speeddownlink data packet access (HSPDA), analog and digital satellitesystems, and any other technologies/protocols that may be used in atleast one of a wireless communications network and a data communicationsnetwork.

FIG. 5A illustrates a flow diagram of process 500, according to anembodiment. At 502, a Control Channel and a Forward Traffic Channel arereceived. At 504, MultipleInputMultipleOutput(MTMO) mode is requested onthe Forward Traffic Channel by sending a MIMORequest message and at 506,overhead messages are monitored. At 508, it is determined if the accessterminal receives a ConnectionClose messages and at 510, aRegistrationRadiusUpdated indication is generated accompanied by theRegistrationRadiusFlag contained in the message. At 512, aConnectionClose message is sent with CloseReason set to “CloseReply”. At514, a ConnectionClosed indication is returned and at 516, transitioningto an Inactive State. Determining if the access terminal receives aConnectionClose messages increases the access terminals efficiency suchthat one or more of the aforementioned embodiments need not occur.

FIG. 5B illustrates a processor 550. The processor referred to may beelectronic devices and may comprise one or more processors configured toprocess Open state by the access terminal. Processor 552 is configuredto receive a Control Channel and a Forward Traffic Channel and processor554 is configured to request a MultipleInputMultipleOutput(MIMO) mode onthe Forward Traffic Channel by sending a MIMORequest message. Processor556 is configured to monitor overhead messages and processor 558 isconfigured to determine if the access terminal receives aConnectionClose messages. Processor 560 is configured to generate aRegistrationRadiusUpdated indication accompanied by theRegistrationRadiusFlag contained in the message and processor 562 isconfigured to sending a ConnectionClose message with CloseReason set to“CloseReply”. Processor 564 is configured to return a ConnectionClosedindication and processor 566 is configured to transition to an InactiveState. Determining if a the access terminal receives a ConnectionClosemessages increases processing efficiency such that one or more of theaforementioned embodiments need not occur. The functionality of thediscrete processors 552 to 566 depicted in the figure may be combinedinto a single processor 568. A memory 570 is also coupled to theprocessor 568.

In an embodiment, an apparatus is described which includes means forreceiving a Control Channel and a Forward Traffic Channel, means forrequesting a MultipleInputMultipleOutput (MIMO) mode on the ForwardTraffic Channel by sending a MIMORequest message, means for monitoringoverhead messages and means for determining if the access terminalreceives a ConnectionClose messages. The means described herein maycomprise one or more processors.

FIG. 6A illustrates a flow diagram of process 600, according to anotherembodiment. At 602, a Reverse Traffic Channel is received and at 604, itis transmitted on a Forward Traffic Channel. At 606, it is determined ifaccess network receives a ConnectionClose message and at 608, aConnectionClosed indication is returned. At 610, the access networktransitions to an Inactive state and at 612, it is determined if theaccess network is closing the connection and, at 614, a ConnectionClosemessage is transmitted and at 616, the access network transitions to theClose state.

FIG. 6B illustrates processor 650. The processor referred to may beelectronic devices and may comprise one or more processors configured toprocess Open state by the access network. Processor 652 is configured toreceive a Reverse Traffic Channel and processor 654 is configured totransmitting on a Forward Traffic Channel. Processor 656 is configuredto determine if access network receives a ConnectionClose message andprocessor 658 is configured to return a ConnectionClosed indication.Processor 660 is configured to transition to an Inactive state andprocessor 662 is configured to determine if access network is closingthe connection. Processor 664 is configured to transmit aConnectionClose message and processor 666 is configured to transition toa Close state. The functionality of the discrete processors 652 to 666depicted in the figure may be combined into a single processor 668. Amemory 670 is also coupled to the processor 668.

In an embodiment, an apparatus is described which includes means forreceiving a Reverse Traffic Channel, means for transmitting on a ForwardTraffic Channel, means for determining if access network receives aConnectionClose message, means for returning a ConnectionClosedindication, means for transitioning to an Inactive state, means fordetermining if access network is closing the connection, means fortransmitting a ConnectionClose message and means for transitioning tothe Close state. The means described herein may comprise one or moreprocessors.

Furthermore, embodiments may be implemented by hardware, software,firmware, middleware, microcode, or any combination thereof. Whenimplemented in software, firmware, middleware or microcode, the programcode or code segments to perform the necessary tasks may be stored in amachine readable medium such as a separate storage(s) not shown. Aprocessor may perform the necessary tasks. A code segment may representa procedure, a function, a subprogram, a program, a routine, asubroutine, a module, a software package, a class, or any combination ofinstructions, data structures, or program statements. A code segment maybe coupled to another code segment or a hardware circuit by passingand/or receiving information, data, arguments, parameters, or memorycontents. Information, arguments, parameters, data, etc. may be passed,forwarded, or transmitted via any suitable means including memorysharing, message passing, token passing, network transmission, etc.

Various modifications to these aspects will be readily apparent to thoseskilled in the art, and the generic principles defined herein may beapplied to other aspects. Thus, the description is not intended to belimited to the aspects shown herein but is to be accorded the widestscope consistent with the principles and novel features disclosedherein.

1. A method of processing Open state at an access terminal in a wirelesscommunication system, comprising: receiving a Control Channel and aForward Traffic Channel; requesting a MultipleInputMultipleOutput (MIMO)mode on the Forward Traffic Channel by sending a MIMORequest message;monitoring overhead messages; determining that the access terminal hasreceived a ConnectionClose message from an access network of thewireless communication system; generating a RegistrationRadiusUpdatedindication accompanied by the RegistrationRadiusFlag contained in theConnectionClose message, wherein the RegistrationRadiusUpdatedindication comprises an indication of an update of aRegistrationRadiusFlag, and wherein the RegistrationRadiusFlag comprisesdata to indicate an idle state registration procedure at the accessterminal; sending a ConnectionClose message with CloseReason setCloseReply; returning a ConncectionClosed indication; transitioning toan Inactive State; and monitoring the Control Channel for a durationafter sending the ConnectionClose message, to facilitate receipt of anunicast message from the access network, wherein the unicast messagecomprises one of a Page message or an ActiveSetAssignment message.
 2. Acomputer readable non-transitory medium comprising computer executableinstructions that, in response to execution, cause a computing system toperform operations, at an access terminal to process an Open statecommand, the operations comprising: receiving a Control Channel and theForward Traffic Channel; requesting a MIMO mode on the Forward TrafficChannel by sending a MIMORequest message; monitoring the overheadmessages; determining that the access terminal has received aConnectionClose message from an access network of the wirelesscommunication system; generating a RegistrationRadiusUpdated indicationaccompanied by the RegistrationRadiusFlag contained in theConnectionClose message, wherein the RegistrationRadiusUpdatedindication comprises an indication of an update of aRegistrationRadiusFlag, and wherein the RegistrationRadiusFlag comprisesdata to indicate an idle state registration procedure at the accessterminal; sending a ConnectionClose message with CloseReason setCloseReply; returning a ConncectionClosed indication; transitioning toan Inactive State; and monitoring the Control Channel for a durationafter sending the ConnectionClose message, to facilitating receiving ofa unicast message from the access network, wherein the unicast messagecomprises one of a Page message or an ActiveSetAssignment message.
 3. Anapparatus operable in a wireless communication system, comprising: meansfor receiving the Control Channel and a Forward Traffic Channel; meansfor requesting a MIMO mode on the Forward Traffic Channel by sending aMIMORequest message; means for monitoring the overhead messages; meansfor determining whether an access terminal has received aConnectionClose message from an-access network of the wirelesscommunication system; means for generating a RegistrationRadiusUpdatedindication accompanied by the RegistrationRadiusFlag contained in theConnectionClose message, wherein the RegistrationRadiusUpdatedindication comprises an indication of an update of aRegistrationRadiusFlag, and wherein the RegistrationRadiusFlag comprisesdata to indicate an idle state registration procedure at the accessterminal; means for sending a ConnectionClose message with CloseReasonset CloseReply; means for returning a ConncectionClosed indication;means for transitioning to an Inactive State; and means for monitoringof the Control Channel for a duration after sending the ConnectionClosemessage, facilitating receiving of a unicast message from the accessnetwork, wherein the unicast message comprises one of a Page message oran ActiveSetAssignment message.
 4. A method of processing Open state atan access network in a wireless communication system, comprising:receiving a Reverse Traffic Channel; transmitting on a Forward TrafficChannel; requesting a MultipleInputMultipleOutput (MIMO) mode on theForward Traffic Channel; determining that an access network has receiveda ConnectionClose message; returning a ConncectionClosed indication;transitioning to an Inactive state; determining if the access network isclosing the connection; transmitting a ConnectionClose messagecontaining a RegistrationRadiusFlag, wherein the RegistrationRadiusFlagcomprises data to indicate an idle state registration procedure at theaccess terminal; transitioning to a Close state; monitoring the ControlChannel for a duration after transmitting the ConnectionClose message,to detect an indication that a unicast message can be received; and inresponse to detecting the indication, forwarding the unicast message,wherein the unicast message comprises one of a Page message or anActiveSetAssignment message.
 5. A computer readable non-transitorymedium comprising computer executable instructions that, in response toexecution, cause a computing system to perform operations, at an accessterminal to process an Open state command, the operations comprising:receiving a Reverse Traffic Channel; transmitting on a Forward TrafficChannel; requesting a MultipleInputMultipleOutput (MIMO) mode on theForward Traffic Channel; determining that the access network hasreceived a ConnectionClose message; returning a ConncectionClosedindication; transitioning to an Inactive state; determining if theaccess network is closing the connection; transmitting a ConnectionClosemessage containing a RegistrationRadiusFlag, wherein theRegistrationRadiusFlag comprises data to indicate an idle stateregistration procedure at the access terminal; transitioning to a Closestate; and monitoring the Control Channel for a duration aftertransmitting the ConnectionClose message, to facilitate receipt of aunicast message from the access network, wherein the unicast messagecomprises one of a Page message or an ActiveSetAssignment message.
 6. Anapparatus operable in a wireless communication system, comprising: meansfor receiving a Reverse Traffic Channel; means for transmitting on aForward Traffic Channel; means for requesting aMultipleInputMultipleOutput (MIMO) mode on the Forward Traffic Channel;means for determining if an access network receives a ConnectionClosemessage; means for returning a ConncectionClosed indication; means fortransitioning to an Inactive state; means for determining if the accessnetwork is closing the connection; means for transmitting aConnectionClose message containing a RegistrationRadiusFlag, wherein theRegistrationRadiusFlag comprises data to indicate an idle stateregistration procedure at the access terminal; means for transitioningto a Close state; and means for monitoring the Control Channel for aduration after transmitting the ConnectionClose message, to facilitatingreceipt of a unicast message from the access network, wherein theunicast message comprises one of a Page message or anActiveSetAssignment message.
 7. A system for processing Open state in awireless communication system, comprising: an access terminal, furthercomprising: a processor; a computer-readable storage mediumcommunicatively coupled to the processor and storing computer executablecomponents to facilitate operation of the processor, wherein theprocessor is configured to: receive a Control Channel and a ForwardTraffic Channel; request a MultipleInputMultipleOutput (MIMO) mode onthe Forward Traffic Channel by sending a MIMORequest message; monitoroverhead messages; determine that the access terminal has received aConnectionClose message from an-access network of the wirelesscommunication system; generating a RegistrationRadiusUpdated indicationaccompanied by the RegistrationRadiusFlag contained in theConnectionClose message, wherein the RegistrationRadiusUpdatedindication comprises an indication of an update of aRegistrationRadiusFlag, and wherein the RegistrationRadiusFlag comprisesdata to indicate an idle state registration procedure at the accessterminal; send a ConnectionClose message with CloseReason setCloseReply; return a ConncectionClosed indication; transition to anInactive State; and monitor the Control Channel for a duration aftersending the ConnectionClose message, to facilitate receipt of an unicastmessage from the access network, wherein the unicast message comprisesone of a Page message or an ActiveSetAssignment message.
 8. A system forprocessing Open state in a wireless communication system, comprising: anaccess network, further comprising: a processor; a computer-readablestorage medium communicatively coupled to the processor and storingcomputer executable components to facilitate operation of the processor,wherein the processor is configured to: receive a Reverse TrafficChannel; transmit on a Forward Traffic Channel; request aMultipleInputMultipleOutput (MIMO) mode on the Forward Traffic Channel;determine that an access network has received a ConnectionClose message;return a ConncectionClosed indication; transition to an Inactive State;determine if the access network is closing the connection; transmit aConnectionClose message containing a RegistrationRadiusFlag, wherein theRegistrationRadiusFlag comprises data to indicate an idle stateregistration procedure at the access terminal; transmit to a Closestate; monitor a Control Channel for a duration after transmission ofthe ConnectionClose message to detect an indication that a unicastmessage can be received; and forward, in the event of detecting anindication, the unicast message, wherein the unicast message comprisesone of a Page message or an ActiveSetAssignment message.
 9. The methodof claim 1, wherein the data of the RegistrationRadiusFlag comprisesdata selected from the group consisting of: a data value indicating thatregistration is to be performed when the access terminal travels adistance more than a registration distance; and a data value indicatingthat registration is to be performed when the access terminal moves to asector with a different latitude and longitude.
 10. The system of claim7, wherein the data of the RegistrationRadiusFlag comprises dataselected from the group consisting of: a data value indicating thatregistration is to be performed when the access terminal travels adistance more than a registration distance; and a data value indicatingthat registration is to be performed when the access terminal moves to asector with a different latitude and longitude.